Brake-drum lathe



Sept. 12, 1944. H. B. BARRETT Y BRAKE-DRUM LATHE Filed Nov. 27, 1941 4Sheets-Sheet 1 INVENTOR. HARRY B. BARRETT Sept. 12, 1944.

H. B. BARRETT BRAKE DRUM LATHE Filed Nov. 2'7, 1941 4 Sheets-Sheet 2 5W1 INVENTOR.

HARRY B. BARRETT Sept. 12, 1944. H. B. BARRETT BRAKE-DRUM LATHE FiledNov. 27, 1941. 4 Sheets-Sheet 3 INVENTOR. HARRY B. BARRETT FIG.9.

Sept. 12, 1944. H. B. BARRETT BRAKE-DRUM LATHE Filed Nov. 2'7, 1941 4Sheets-Sheet 4 BY F1618.

Fl G .i 7.

INVENTOR.

HARRY B. BARRETT 14 TTOR/VE? Patented Sept. 12, 1944 2,357,803BRAKE-DRUM-LATHE Harry B. Barrett, St. Louis, Mo., assignor to H. B.

Barrett Company, Ltd., St.

ration of Nevada Louis, Mo., a corpo- Application November 27, 1941,Serial No. 420,65'l

18 Claims.

This invention relates generally to metal turnme and truing machinesand, more particularly, to certain new and useful improvements in metaltruing machines of the type commonly known as lathes especially, thoughnot exclusively, adapted for use in connection with brake-drums and thelike.

My invention has for its primary objects the provision of a lathe of thetype mentioned which is simple and economical in construction, which ishighly precise and accurate in operation, which is readily portable andadjustable so as to be adaptable to a wide variety and range ofpractical situations and conditions ordinarily met in repair shops andmaintenance stations, which may be conveniently employed in the handlingof large sized brake-drums, such as those encountered on large transporttrucks and other heavy motor vehicles, which is universal in itsadaptability to various types of brake-drum truing operations and may beemployed for drum-grinding, as well as drum turning, and which isotherwise highly efllcient in the performance of its stated functions.

And with the above and other objects in view, my invention resides inthe novel features of form, construction, arrangement, and combinationof parts presently described and pointed out in the claims.

In the accompanying drawings (four sheets) Figure 1 is a so-calledexploded perspective view of a lathe constructed in accordance with andembodying my present invention;

Figure 2 is an assembled perspective view of the lathe in connectionwith a dual-wheel mounted brake-drum;

Figure 3 is a reduced perspective view of the lathe in connection with adismounted brakedrum;

Figure 4 is an enlarged sectional view of the lathe taken approximatelyalong the line 4-4, Figure 3;

Figure 5 is an enlarged side elevational view, partly broken away and insection, of the lathe in operative relation to a dual-wheel mountedbrake-drum;

Figure 6 is a fragmental rear elevational view of the lathe;

Figure 7 is a vertical sectional view of the lathe taken approximatelyalong the line 1-1, Figure 5;

Figure 8 is a sectional view of the lathe taken approximately along theline 8-8, Figure '7;

Figures 9 and 10 are transverse sectional views of the lathe takenapproximately along the lines 9-9 and Ill-I0, respectively, Figure 8;

Figures 11 and 12 are detail sectional views of the lathe takenapproximately along the lines ll-l I and l2-l2, respectively, Figure 10;

Figure 13 is a detail sectional view of the lathe taken approximatelyalong the line l3-I3, Figure 9;

Figure 14 is a transverse sectional view of the lathe takenapproximately along the line l4-l4, Figure 8;

. Figure 15 is a transverse sectional view of the lathe takenapproximately along the line l5--l5, Figure 14; I

Figure 16 isan enlarged detail sectional view illustrating the mountingand counterbalancing of the grinding tool;

Figure 17 is an enlarged plan view of the grinding tool, illustratingthe adjustable mounting thereof for engagement with the surface of abrake-drum, a fragmentary portion of the latter being schematicallyshown in section; and

Figures 18 and 19 are transverse sectional views taken approximatelyalong the lines l8l8 and l9l 9, respectively, Figure 16.

Referring now in more detail and by reference characters to thedrawings, which illustrate a preferred embodiment of my presentinvention, the lathe is mounted for operation on a suitable preferablysmooth floor or support, such, for instance, as a track-assembly A and,broadly speaking, includes a base or support in the form preferably ofan elevator-carriage B, which is rollably shiftable on the track-way A,and a selfpowered automatic feed lathe head 0 preferably detachablymounted on and carried by the base or carriage B.

"plurality of uniformly spaced tie-rods 5 fixed at their ends in, andextending transversely between, the rail flanges 3. Thus a dual-wheel Wor the like may be set transversely upon the track A, as shown in Figure1, the rail flanges 3 functioning somewhat as a cradle and supportingthe wheel W with the axis of its hub in upwardly and equidistantlyspaced parallel relation to the rails l.

Rockably mounted preferably on the rearmost tie-rod 5', is a latchingbook 6 fixed against lateral translation along the tie-rod 5 by means ofa set-screw I threaded into the shank 8 of the hook 6 to project into ashallow annular groove 9 suitably turned or rolled into tie-rod 5', allas best seen in Figure 4 and for purposes presently fully appearing.

The support or elevator carriage B comprises a base-casting ll) ofapproximately rectangular shape and preferably integrally provided atits four corners with horizontally projecting ears arranged in forwardlyand rearwardly projecting transversely aligned pairs and coaxially boredfor accommodating transverse shafts l2, which extend horizontallytherethrough and are provided at their outer ends with small flangedwheels I3 sized and spaced for rollable movement either along thetrack-face 4 of the rail-flanges 3 or upon any other suitable support,floor, or the like.

lAlong its rear transverse margin midway between the ears II, the basecasting I is provided with an upstanding lug l4 for detent-formingengagement with the hook 6.

On its upper face and along one lateral margin, the frame or casting I0is formed with an upstanding boss or shoulder I5, which is, in turn,reinforced by two spaced webs l6 extending longitudinally across theupper face, and feathered downwardly toward the opposite lateral margin,of the frame or casting l0, and fixed in, and extending perpendicularlyupwardly from, the boss l5, are two spaced cylindrical slide-posts l1,

Shiftably mounted on, and extending between, the slide-posts I1, is aframe or platform 18 preferably integrally including a horizontallydisposed bracket-plate or shelf I9 projecting inwardly over thebase-casting l0 and provided adjacent its forward margin with anupstanding threaded stud 20 and along its rear margin with upstandingtransversely aligned ears 2| having registering apertures 22 formounting a pull-rod 23.

Mounted rotatably at its lower end in the boss l and threaded verticallythrough the frame l8 preferably midway between the slide-posts I1, is anelevator-screw 24 having a squared upper end, as at 25, for detachablyreceiving a suitable actuating socket-ended crank 26.

The lathe C proper comprises a suitable shell 21 for housing an electricmotor 28, and forming part, and disposed on a side face, of the shell21, is a box-like auxiliary shell 29 for conventionally mounting andhousing a motor controlling rheostat 30, a separable plug receptacle 3|,and a grinder control rheostat 32.

At its forward end, the motor-shell 21 is formed with 9. preferablyintegral sleeve-like extension 33 having a narrow external land 34 andat its forward and diametrally reduced in the provision of an annularbearing-collar 35 through which the motor-shaft 36 is journaled.

Clamped or otherwise secured upon the shellextension 33, is atransmission housing 31 formed internally with a tubular bearing 38 forsnugfltting embracing engagement with the bearingcollar 35, thecompanion bearing-members 35, 38, being preferably suitably securedtogether as by means of a pair of oblique set-screws 39.

Forming preferably an integral part of the housing or shell 31 anddisposed in upwardly spaced parallel relation to, and projectingforwardly beyond, the motor-shaft 36, is a tubular hub-member or thelike 40 ored for lengthwise 7 slidably, but non-rotatively,accommodating an arbor 4| equipped longitudinally with a rackformingseries of laterally presented teeth 4|.

At its forward end, the arbor 4| is diametrally reduced in the provisionof an intermediate section 42, in turn, diametrally reduced in theprovision of a spindle 43 for accommodating a, pair of suitably sizedoppositely disposed work-holding or engaging cones 44, 44', the one cone44 being adapted normally for endwise abutment against the end face ofthe intermediate section 42 and the other cone 44' being shiftably urgedtoward the cone 44 by means of a nut 45 threaded on the spindle 43, allas best seen in Figure 5.

On its outer face and intermediate its ends, the hub-member 40 ismachined down for a substantial portion of its length for providing anannular abutment 46 and a bearing 41, and journaled upon the bearing 41and abutting at its rear end against the shoulder 46, is a worm 46provided at its opposite end with a forwardly projecting diametrallyreduced annular extension 49 disposed tightly within, and pinned to, acollar-portion 50 of an annular tool-carrying member 5| sleevedcoaxially upon the hub-member 46 and projecting forwardly of, andbeyond, the shell 31, the member 5| being longitudinally split andlipped at its forward end, as at 52, and having a communicatingtransverse split, as at 53, in the provision of a clamp for receiving,and by means of clamping bolts 54 retaining, an annular bushing 55 sizedfor snugly fittin for rotation upon the bearingface 41 of the hub-member40, which latter, at its outer end, is provided with a grease-retainingand clamp-collar assembly 56 for securing the tool-carrying member orbar 5| against longitudinal translation along the hub-member 40,

Removably secured, as by means of screws 51 or the like, upon theforwardly presented margin of the transmission shell or housing 31, isan annular cover-plate 58 suitably apertured for snug-fitting rotatableengagement with the outer face of the tool-carrying member 5| andprovided with a spring-pressed felt sealing ring 59.

Formed preferably integrally with the transmission housing 31 anddisposed at right angles to the axis of the arbor 4|, is a web-member 60provided at its free end with a suitably lined bearing ring 6|, androtatably mounted in and projecting through the ring 6| and journaled atits forward end in the cover plate 56, all as best seen in Figure 8, isa driven-shaft 62 drivingly connected at its rear end by a pair ofconventional separable coupling elements 63 to the motor shaft 36.

Fixed upon the driven-shaft 62 intermediate the bearing-ring 6| and thecover-plate 58, is a pinion 64 meshing with a relatively large ring gear65 mounted on the collar 50 of the toolcarrying member or bar 5| andheld in place preferably by suitable machine screws 66.

Fixed upon the forwardly presented face of the cover-plate 58 inconcentric relation to the tool-carrying bar 5|, is a dielectrl ring 61provided, in turn, in its forward face with a pair of spaced concentriccommutation rings 68, 66, respectively connected by a suitable electricconduit Hi to the grinder control rheostat 32.

Fixed upon the outer face of the tool-carrying bar 5| in forwardlyspaced relation to the dielectric ring '61, is a brush-carrying ring 1|formed with an enlargement 12 having two relatively large drill holes I3lined with dielectric tubes I4, and disposed within each of the tubesI4, is a metallic brush-carrying barrel I5 internally threaded at itsouter end for receiving a screw type closure element I6 and upset at itsinner end for retentive engagement with a trans- Also mounted in andextending through the"; enlargement I2 midway between the brushes I8, ism a dielectric socket -88 having companion conductor-receptacles 8|suitably connected at their inner end by conductors 82 to thebrush-holding barrel 15, all as st seen in Figur 12 and for purposespresently fully appearing.

, I81 being threaded for movement in the clam In its upper portion, theshell 31 is formed with a bearing. as at 31, mounted'in and extendingthrough which, as best seen in Figure 9. is a tubular shaft 83 havinguniform outer and inner diameters throughout its length except adjacentits outer endfwhere the shaft 83 is internally tapered, as at 84, toprovide a bore 85 of reduced diameter. Adjacent such outer end, theshaft 83 is further provided or formed with a radially extendingcrank-arm 86, equipped at its outer end with a conventional handle 81.

Disposed lengthwise within the shaft 83 and terminating at its outer endjustshort of, the taper 84, is a quill 88 provided at its inner pro,-jecting end with a worm -88. Extending rotat ably through the quill 88,is a shaft 89 journaled at its inner end in hanger-bearings 98 dependingin the shell 31, the shaft 89 being provided at its outer end with adiametrally enlarged frustoconical extension 9| sized to fit snuglywithin the tapered portion 84 of the shaft-83 and having an outwardlyprojecting threaded shank 92 for receiving a manually 'operable lockingnut 93.

The shaft 83 and quill 88 are permanently secured together, as by a pin94, while the shaft 89 is releasably connected to theshaft 83 as bymeans of the friction created or arising between the cone portion 9|thereof and the tapered portion 84 of the shaft 83 when the nut 93 istightened.

Keyed upon the shaft 89 intermediate the.

hangers 98, is a worm-gear 95 having meshing engagement with the worm 48associated with Journaled at its upper end in a bifurcated boss 96depending from, and preferably formed integrally on the inner face of,the transmission housing or shell 31 and at its lower end in abracket-arm 91 extendinginwardly from, and likewise preferably formedintegrally upon the inner face of, the transmission housing or shell 31,is a jack-shaft 98, keyed upon which is a worm gear 99 meshing with theworm 88', and also keyed on the jack shaft 98 adjacent its lower end, isa pinion I88 meshing with the rack teeth 4 I all as best seen in Figure13.

At its forward end, the tubular tool-carrying bar 5| is preferablyintegrally provided with an enlarged pad I8I provided in its upper facewith a transversely extending V-shaped recess I82, and detachablysecured upon the pad I8 I, as by means of bolts I83, is a clamp-frameI84 having an opposed V-shaped recess I85 complementary or companion tothe recess I82 for slidably or adjustably accommodating a transverselyextending tool-holder bar I86 having a corresponding rectangular orsquare cross-section, a clamp screw frame I84 for impinging engagementagainst one longitudinal corner of the tool-holder bar I86 for firmlysecuring the latter in an adjusted position. In its one end face, thetool-holder bar I86 is drilled and tapped for receiving a. threadedstud-bolt I86 for securing thereon an end-plate I88, and mounted forrotation in, and extending through, the end-plate I88 in suitably spacedparallel relation to the bar I85 and also threadedly mounted in the padIN, is a feed-screw I89 provided with a hand-wheel H8 at its outer endfor manual manipulation. Fixed on the shank of screw I89 intermediatethe end-plate I88 and the wheel I58, is a graduated ring III forfacilitating the determination of the amount of tool-feed.

At or adjacent its other end, the tool-holder bar I86 is provided with apair of complementarily shaped or companion clamping members II2detachably secured together by bolts I I3, the lower member I I2 beingprovided with a depending lug II4 longitudinally drilled and slotted andformed with ears I I5 and equipped with a clamping-bolt II6for'clampwise adjustably accommodating a tool-bar I IT, in turn,conventionally provided at its outer end with a lathe-tool or bit II8,all as best seen in Figures 14 and 15.

Also provided for disposition upon the tool holder bar I86 in place ofor substitution for the tool-holder c, is a grinder mounting clamp c,which includes a clamping-plate I I9 substantially identical with theplate II 2 and equipped with bolts vI I3 for securement to acomplementarily shaped or companion nether plate I28 having a laterallyprojecting plate-like extension I2l, in

g and guard frame ,1, all as best seen in Figures 17 and 18.

Alsoprovided for detachable clamping engagement with the tool-holder barI86 at its opposite end is a C-clamp I25 having a screw I26 for clampingor impinging engagement with the bar I86, the clamp I25 being providedwith a flange I21, to which, as by means of a bolt I28, a weight I29 issecured for counterbalancing the weight of the motor I24, all as bestseen in Fi ures 16 and 19.

The transmission housing or shell 31 is suitably formed or provided withan upstanding carrying handle I38 and on its under face with a dependingU-shapecl supporting leg I3I adapted for resting on the bracket-plate'orshelf I9, the leg I3I having a horizontally disposed bight I32 suitablyapertured for engagement with the stud 28, to which the same isdetachably secured as by means of a nut 28'.

The shell 31 is also suitably formed with a depending lug I33. which isdisposed in rearwardly spaced parallel relation to the leg member I3Iandsized for fitting snugly between the ears'2l of the elevator-carriagebracket I9, the lug I33 being transversely drilled in the provision ofan aperture I34 registering with the apertures rotation of the crank 28and the elevator-screw 24 until the arbor 4| is as nearly aligned withthe axis of the hub of wheel W as may be determined.

by the eye, and it may be remarked that, after a relatively short periodof experience and training, the average mechanic becomes capable ofestimating such alignment to a very nice degree of accuracy. 1

The elevator carriage B and its supported lathe C are then shiftedtoward the wheel W and the cones 44, 44, slipped in place. By tighteningthe nut-sleeve 45, the cones 44, 44', are drawn tightly in place,forcibly bringing the arbor 4| into precise axial alignment with the hubof the wheel W, as shown in Figure 5. In this connection, it should benoted that any slight misalignment between the hub of wheel W and thearbor 4| will be corrected as the cones 44, 44', are tightened intoplace, such tightening causing the entire elevator carriage B to tiltslightly and possibly even tilting the wheel W slightly. Accordingly,when the cones 44, 44', are securely tightened in place, the crank 28may be manipulated to raise or lower the lathe C as may be required torelieve any relative tilting of the elevator carriage B or wheel W.

A suitable electric cord or the like (not shown) is now plugged into theplug or receptacle 3| and the motor 28 energized by suitable adjustmentof the motor-controlling rheostat 30. As the motor 28 rotates, thepinion 84 drives the ring gear 65, thereby rotating the tool-carryingbar 8| and its associated structure and causing the tool 8 to turn orcut the surface of the brake-drum d of the wheel W. As the tool-carryingbar rotates, the worm 48 is rotated and, in turn, rotates the worm gear95, shaft 89, worm 88', worm gear 99, jack shaft 98, and pinion I00, therotary movement of the latter, which is in mesh with the rack-teeth 4|,causing a relative movementbetween the arbor 4| and shell or housing 31,that is to say, in the present instance, since the arbor 4| is securedby means of the cones 44, 44', to the stationary wheel W, causing notonly the hubmember 48 and its associate parts, but substantially theentire lathe head proper C and base B, to correspondingly move forwardlyon and relatively to the arbor 4| and track-way or other support A andthereby feeding the tool 8 across the face of the brake-drum d.

After the first or initial out has been taken across the surface of thebrake-drum d, the motor 28 is turned oil. and the tool-feed mechanismdisengaged by loosening the nut 93. Thereupon, the shaft 83 and quill 88may be turned independently of the shaft 88 by manipulation of thehandle 81 in the reverse direction to its automatically driven rotationfor retracting the hub-member 48 or lathe head C proper and base B onthe trackway or support A and withdrawing the tool H8. The tool bar I08may then be shifted slightly with reference to the tool-carrying bar 5|by proper manipulation of the hand-wheel H8 and feed screw I89 toadvance the tool H8 into position for taking a second cut, whereupon,nut 83 being tightened, the motor 28 may again be energized and theturning operation repeated.

When the drum d has been turned to the proper diameter and renderedtruly concentric, the

operation may be finished by replacing the tool holder 0 with themotor-supporting member 0' speed of the grinder motor I24 is adjusted bythe grinder control rheostat 32 and the motor I24 energized for rotatingthe grinder y around the arbor 4| and feeding the same across thesurface 8 of the brake-drum d to polish the latter. The depth of grindercut will, of course, be controlled by suitable manipulation of thehand-wheel H8 and feed-screw I88 and the grinder wheel a will be fedacross the face of the brake-drum d in 10 the same manner as previouslydescribed for the turning operation.

When the lathe head C is mounted in connection with a fixed orstationary dual-wheel W or other work, as shown in Figures '1 and 2, the

arbor 4| is, as stated, stationary, and the lathe head C and base B areshiftable relatively to the arbor 4| and on the track-way or support A.When, however, the lathe is employed for turning and truing a dismountedbrake-drum D or other such work, as shown in Figure 3, the elevatorcarriage B is detachably secured to the base or track A by means of thelatch-hook 8 and the drum D is suitably mounted and supportedconcentrically about, and for movement axially with,

the arbor-spindle 43. The truing or turning operations are carried outin identically the same manner as previously described, but the lathehead proper C and base B are now stationary and the arbor 4| islengthwise movable with its at- 39 tached drum or other work D forshifting the same with respect to the rotating tool 8 for effectingcutting actuations thereby on the drum or work D, as will be clearlyapparent.

The lathe fulfills in every respect the objects stated, and it should beunderstood that changes and modifications in the form, construction,arrangement, and combination of the several parts of the lathe may bemade and substituted for those herein shown and described without de- 40parting from the nature and rinci l vention. p p e of my in Having thusdescribed my invention, what I claim and desire to secure by LettersPatent is- 1. A lathe comprising, in combination with a track-way, acarriage disposed normally for movement on the track-way, a head mountedon and movable with the carriage, an arbor mounted for movementlongitudinally on the head, a cutting-tool mounted for rotary movementon the arbor, means for shifting the arbor and rotarily shifting thetool in a work-surfacing operation, and means for detachably securingthe carriage in a selected location on the track-way for such operation.

2. A lathe comprising, in combination with a track-way extended toreceive and support the work in fixed position for surfacing operations,a carriage and a head including an arbor and work-surfacing meansrotatable about the arbor,

the head being adjustable on the carriage for alignment of the arborwith the work and the carriage and head being shiftable on the trackwayduring rotary actuations of the surfacing means in engagement with thework.

3. In a work-surfacing lathe, a head comprising a housing, an arboradapted for positioning the work, a tubular bar engaged with the housingand rotatable about the arbor, driving means in the housing connectedwith the bar for rotarily actuating the latter, commutation ringsmounted on the housing concentrically with the bar, brushes carried bythe bar for contactive engagement with said rings, an electric motordriven surfacing tool on the bar, and means for 4. In a lathe, incombination, non-rotary base-means adapted for movable dispositionlongitudinally upon a support and a head mounted on the base-means, thehead including an arbor for attachment to a fixed work, work-surfacingmeans rotatable about the arbor, and co-operable means between the baseand arbor actuable on rotation of the work-surfacing means for movingthe base for shifting the rotating surfacingmeans axially elatively tothe work during a surfacing operation.

5. In a lathe, in combination with non-rotary base-means adapted formovable disposition longitudinally upon a support, of a head includingan arbor for attachment to a fixed work, a shell having connection withthe base-means and sleeved on the arbor, work-surfacing means rotatableabout the arbor and having connection with the shell, and co-operablemeans between the arbor and shell actuable on rotation of thework-surfacing means for moving the shell and base-means for shiftingthe connected rotating surfacing-means axially relatively to the workduring a surfacing operation.

6. In a lathe, in combination with non-rotary base-means adapted formovable disposition longitudinally upon a support, of a head includingan arbor for attachment to a fixed work, a shell attached to the baseand sleeved on the arbor, work-surfacing means disposed for rotationabout the arbor and having connection with the shell, means for rotarilyactuating the work-surfacing means, and rack-and-gear means between thearbor and shell actuable on rotation of the worksurfacing means formoving the shell and base for shifting the rotating surfacing-meansaxially relatively to the work during a surfacing operation. I I i '7.In a lathe, in combination, a base, an axially shiitable arbor forattachment to a shiftable work, a shell attached to the base and sleevedupon the arbor, work-surfacing means rotatable about the arbor in aselected plane of rotation and having connection with the shell, andcooperable means between the arbor and shell actuable on rotation of thework-surfacing means for shifting the arbor and attached work axiallyrelatively to the rotating surfacing-means and its selected plane ofrotation.

8. In a lathe, in combination, base-means adapted for stationarydisposition upon a support, and a head mounted on the base-means, thehead including an axially shiftable arbor for attachment to a shiftablework, work-surfacing means rotatable about the arbor in a selected planeof rotation, and co-operable means between the base and arbor actuableon'rotation of the work-surfacing means for shifting the arbor andattached work axially relatively to the basemeans and the plane ofrotation of the rotating surfacing-means.

9. In a lathe, in combination with base-means adapted for stationarydisposition upon a support, of a head including an axially shiftablearbor for attachment to a s'hiftable work, a shell attached to the baseand sleeved upon the arbor, work-surfacing means rotatable about thearbor in a selected plane of rotation and having connection with theshell, and co-operable means between the arbor and shell actuable onrotation of the work-surfacing means for shifting the arbor and attachedwork axially relatively to the base-means and the plane of rotation ofthe rotating surfacing-means.

10. In a lathe, in combination with base-means adapted for stationarydisposition upon a support, of a head including an axially hiftablearbor for attachment to a shiftable work, a shell attached to the baseand sleeved upon the arbor, work-surfacing means rotatable about thearbor in a selected plane of rotation and having connection with theshell, means for rotarily actuating the work-surfacing means, andrack-andgear means between the arbor and shell actuable on rotation ofthe work-surfacing means for shifting the arbor and attached workaxially relatively to the base-means and the plane of rotation of therotating surfacing-means.

11. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a motorand its shell, a transmissionhousing mounted on said shell and embracina projecting end of the motor-shaft, an apertured hub-member on thehousing, an arbor sleeved within the hub-member, a tool-carrying membersleeved for actuation on the hub-member, and actuating means connectingthe tool-carrying member with the motor-shaft.

12. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a,motor and its shell, a transmissionhousing mounted on the shell andembracing a projecting end of the motor-shaft, an apertured hub-memberon the housing, an arbor sleeved within the hub-member, a tool-carryingmember sleeved on the hub-member for rotary movement, actuating meansconnecting the toolcarrying member with the motor-shaft, and meansassociated with the hub-member and toolcarrying member for effectingrelative longitudinal movement between the hub-member and arbor duringrotary actuation of the tool-carrying member.

13. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a motorand its shell, a transmissionhousing mounted on the shell and embracinga projecting end of the motor-shaft, a hub-member on the housing, anarbor sleeved within the hub-member, the arbor having a longitudinalrack, a tool-carrying member sleeved on the hubmember for rotarymovement, actuating means connecting the tool-carrying member with themotor-shaft, and gearing connecting the rack of the arbor and thetool-carrying member for effecting relative longitudinal movementbetween the hub-member and the arbor during rotary actuation of thetool-carrying member.

14. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a motorand its shell, a transmissionhousing mounted on the shell and embracinga projecting end of the motor-shaft, a hub-member on the housing, anarbor sleeved within the hub-member for axial disposition with respectto the work, a tubular bar sleeved on the hubmember for rotary movementabout the arbor, actuating means connecting the bar with themotor-shaft, and a tool-carrying member mounted on the bar forinterchangeably mounting surfacing tools for respective engagement withthe work.

15. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a motorand its shell, a transmissionhousing mounted on the shell and embracinga projecting end of the motor-shaft, a hub-member on the housing, anarbor sleeved within the hub-member ior axial disposition with respectto the work. a tubular bar sleeved on the hubmember for rotary movementabout the arbor, actuating means connecting the bar with themotor-shaft, a tool-holder mounted transversely on the bar, a surfacingtool mounted on the holder, and means on the holder engaged with the barfor adjustably shifting the holder in relation to the bar for increasingor decreasing the depth oi cut oil the tool.

16. A lathe comprising, in combination, basemeans for disposition upon asupport, a head mounted upon the base-means, the head comprising a motorand its shell, a tramnissionhousing mounted on the shell and embracing aprojecting end of the motorshait, a hub-member on the housing, an arborsleeved within the hub-member for axial disposition with respect to thework, a tubular bar sleeved on the hubmember for rotary movement aboutthe arbor, actuating means connecting the bar with the motor-shaft,manually operable means for shifting the hub-member and bar in relationto the arbor, and means for connecting the manually operable means withthe bar for driving actuation thereby.

17. A lathe comprising, in combination, basemeans, a head mounted uponthe base-means, the head comprising a motor and its shell, atransmission-housing mounted .on the shell and embracing a projectingend of the motor-shaft,

a hub-member on the housing, an arbor sleeved within the hub-member foraxial disposition with respect to the work, a tool-carrying membersleeved on the hub-member for rotary movement, and actuating meansconnecting the tool'- carrying member with the motor-shaft, thebasemeans being adapted for disposition upon a support and the headhaving connection for adjustment with the base-means for aligning iearbor with the axis of the work.

18. A lathe comprising, in combination, basemeans for disposition upon asupport, a platform, a head mounted uponthe platform, the headcomprising a motor and its shell, a transmission-housing mounted on theshell and embracing a proiecting end of the motor-shaft, a hub-member onthe housing, an arbor sleeved within the hub-member for axialdisposition with respect to the work, a tool-carrying member sleeved onthe hub-member for rotary movement, and actuating means connecting thetool-carrying member with the motor-shaft, the platform havingadjustable connection with the basemeans for vertically shifting thehead for aligning the arbor with the axis of the work.

' HARRY B. BARRETT.

